Mechanism Study And Numerical Simulation Of Fractured Horizontal Wells Flowback Behavior In Tight Sandstone Oil Reservoirs

The development of tight sandstone reservoirs,the use of horizontal wells multi-stage fracturing technology,pressure back row has been one of the important parts of hydraulic fracturing operations,will affect the effect of increasing production and transformation.At this stage of the back row operations,and more rely on field experience,there is a great blindness and randomness,the return rate is generally low,a large number of fracturing fluid retention.Recent studies have shown that the dynamic effect of capillary force in dense reservoirs is significant,which is an important reason for the low return rate and must be considered.In this paper,the dynamic capillary force of tight sandstone reservoir and its influence on the backwash process are described by experiment and numerical simulation.The fractured model of fractured horizontal well considering the dynamic capillary force of compact reservoir is established.The results show that the dynamic effect of the capillary force in the tight sandstone reservoir is significant and must be taken into account in the process of returning the sand.The dynamic effect of the core force of the different permeability is different,the core is denser and the dynamic effect of the capillary force is more obvious.Have an impact on the indicators of the return operation.In this paper,the function of the existing commercial software is explored,and the backflow process of the fractured fractures in the horizontal wells of the dense reservoir is studied by numerical simulation.The influence of the dynamic capillary force and the parameters of the fracturing operation on the backlash is studied preliminarily,Which can help us to understand the mechanism of the large amount of fracturing fluid and the influence of post-pressure production,which is of great significance for the development of reasonable fracturing construction and post-press return system.